<11. Inspection and Maintenance>
11-7
IM 11M12A01-04E 11th Edition : Jul. 19, 2017-00
11.1.6 Stopping and Re-starting Operation
<Stopping Operation>
When operation is stopped, take care of the followings so that the sensor of the detector cannot
become unused.
CAUTION
When operating an instrument such as boiler or industrial furnace is stopped with the zirconia
oxygen analyzer operation, moisture can condensate on the sensor portion and dusts may stick
to it.
If operation is restarted in this condition, the sensor which is heated up to 750°C rmly xes the
dusts on itself. Consequently, the dusts can make the sensor performance very lower. If a large
amount of water is condensed, the sensor can be broken and never be used.
To prevent the above nonconformity, take the following action when stopping operation.
(1) If possible, keep on supplying the power to converter and owing reference gas to the
sensor.
If impossible to do the above, remove the detector.
(2) If unavoidably impossible to supply the power and removing the detector, keep on following
air at 600 ml/min into the calibration gas pipe.
<Restarting Operation>
When restarting operation, be sure to ow air, for 5-10 minutes, at 600 ml/min into the calibration
gas pipe before supplying the power to converter.
11.2 Inspection and Maintenance of the
Converter
The converter does not require routine inspection and maintenance. If the converter does not
work properly, in most cases it probably comes from problems or other causes.
n Replacing Fuses
This equipment incorporates a fuse. If the fuse blows out, turn off the equipment power and
replace it in the following procedure.
CAUTION
If a replaced fuse blows out immediately, there may be a problem in the circuit. Check the circuit
carefully to nd out why the fuse has blown.
Before removing the electronics, touch the grounded metal part to discharge any static electricity.
(1) Remove the display cover (Figure 11.5).
(2) Remove the three screws that are located toward you, among the four screws shown in
Figure 11.6. Loosen the remaining one.
(3) Move the electronics up to remove it.
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